There is an updated pull request by olafmersmann against master on the void-packages repository

https://github.com/olafmersmann/void-packages python3-numpy
https://github.com/void-linux/void-packages/pull/27797

python3-numpy: Use OpenBLAS when available.
Just like `python3-scipy`, `python3-numpy` should use OpenBLAS when available and fall back to BLAS/LAPACK otherwise.

A patch file from https://github.com/void-linux/void-packages/pull/27797.patch is attached